Scope_of_Work_-_Gauley_District_Office_2018.docx

Scope of Work Gauley Ranger District Office Heat Pump Project

DIVISION 1 – GENERAL REQUIREMENTS

01 10 00 - Summary

01 31 14 – Facility Services Coordination

01 41 00 – Regulatory Requirements

01 70 00 – Execution and Closeout Requirements

01 78 00 – Closeout Submittals

DIVISION 23 – MECHANICAL

23 74 13 – Packaged Outdoor Central-Station Air-Handling Units

Gauley Ranger Office Heat Pump Project 2018

SECTION 01 10 00 - Summary

Part 1 – General

A. Project Description:

1. Work includes removing all of the components of the following gas-electric units at the project site:

i. (2) Trane units Model No. YCH090B3L0AB

ii. (1) Trane unit Model No. TCC024F100AA

2. Install (2) new packaged heat pump units with duct detectors.

B. Related Work:

Contractor shall complete all required electrical, plumbing and construction work required to make a complete and operable system.

C. Project Location:

USDA Forest Service Gauley District Office 932 N. Fork Cherry Road Richwood, West Virginia 26261

SECTION 01 31 14 – Facility Services Coordination Part 1 – General A. Work Hours:

All work must be completed between the hours of 8:00 AM and 4:30 PM, Monday thru Friday excluding Holidays when no work shall be performed.

B. Mechanical and Electrical Coordination:

The interruption of mechanical and electrical services to other parts of the building shall be coordinated with the designated Forest Service Representative.

C. Construction Schedule:

A proposed schedule of work for the project construction shall be submitted to the COR for approval 5 days prior to starting construction. The work must be planned and executed to minimize conflict with the office daily activities.

D. Storage of Materials:

The Contractor may store materials and equipment at the work site at his own risk. All materials must be kept in an area designated by the COR and be neat and orderly.

E. Facilities and Utilities:

The Contractor may use electric, potable water, and restrooms facilities at no cost. Restroom facilities will available only when Forest Service employees are present in the office.

SECTION 01 41 00 – Regulatory Requirements Part 1 – General A. All work under this contract shall comply with current applicable codes and regulations including but not limited to:

1. National Electrical Code

2. International Building Code

3. International Mechanical Code

4. International Plumbing Code

5. International Fuel Gas Code

6. National Fire Protection Association

7. Environmental Protection Agency

8. Manufacturer’s recommendations Whenever the specifications call for or describe materials or construction of better quality or larger size than are required by the above code and regulations, the provisions of these specifications shall take precedence.

B. All products shall bear the label of the required testing and certifications agencies (UL, AGA, AMCA, CTI, DSA, etc).

C. All portions of mechanical systems (equipment, piping, valves, ductwork, etc.) shall be rated for the intended service fluid, temperature and pressure.

D. All equipment and products requiring electrical connections shall be UL or ETL listed and approved for the specific application in which installed.

E. All gas-fired equipment shall also be AGA or CSA listed for the specific application.

F. Do not use any product or material made outside of the United States, Mexico, or Canada.

SECTION 01 70 00 – Execution and Closeout Requirements Part 1 – General A. Cutting and Patching:

Any damage to existing facilities resulting from the contractors’ actions shall be repaired to original condition by the contractor. All penetrations thru walls shall be sleeved (if required), caulked, and sealed to form an air tight seal.

B. Coordination:

1. Verify that utility requirements and characteristics of new operating equipment are compatible with building utilities.

2. Coordinate space requirements, supports, and installation of mechanical and electrical work that are indicated. Place any required piping, ductwork, and conduit parallel with lines of building.

C. Protection of Installed Work:

1. Protect installed work from damage.

2. Protect walls, projections, jambs, sills, floors, stairs, and other surfaces from damage, dirt, and wear.

D. System operation:

1. Start the system and make any necessary adjustments. Verify that the system operates in all modes as designed.

2. The system shall be tested & balanced by a qualified agency/person with experience in balancing the systems specified hereunder. The operation of the air conditioning system is expected to generate some noise; however, in no case shall rumbling, squealing, whistling, or intrusive hissing be accepted at the final inspection.

3. Auxiliary heat will only operate if heating load cannot be met by the heat pump alone, other than during outdoor coil defrost cycles. Wire the outdoor thermostat to energize auxiliary heat only on the last thermostat stage and when outdoor air temperature is less than 40F.

4. Instruct the designated Forest Service Representative in the proper operation and maintenance of the system.

E. Cleanup:

The site shall be left in a “broom clean” condition. Any and all removed components shall become property of the contractor and removed off site.

SECTION 01 78 00 – Closeout Submittals Part 1 – General A. Operation and Maintenance Manuals:

1. Three (3) copies of O&M manuals shall be furnished; each bound in a loose ring notebook and shall include all instructions as furnished by the equipment manufacturer plus any system specific instructions, shop drawings, and spare parts lists. It shall also include the name, address and phone number(s) of the nearest qualified service technician.

2. Maintenance Requirements: Include routine procedures and guide for preventative maintenance and trouble shooting.

B. Warranties:

Manufacturer’s warranties and product registration shall be completed with the manufacturer as required by the contractor within 10 days after completion of the applicable item of work. Copies shall be submitted to the Contracting Officer.

C. Submittal Requirements:

All submittals must be submitted within 7 days after Notice to Proceed. Items requiring submittals are:

1. Manufacturer’s Product data for HVAC equipment.

2. Duct/Pipe insulation.

3. Electrical diagrams for power supply as well as control wiring to include locations of shut offs, grounding locations, conductor type/sizes, and location of thermostats.

4. Manufacturer’s recommended start up procedures.

5. Cut sheet/shop drawings illustrating how new system will connect to existing ductwork.

SECTION 23 74 13 – Packaged Outdoor Central-Station Air-Handling Unit Part 1 – General A. This section covers the installation of the HVAC equipment as specified herein. It is the responsibility of the contractor to insure that the system installed will be adequately sized, tested, balanced, and fully operational upon completion of the work. All work shall be in accordance with the applicable codes and regulations as stated in Section 014100.

B. Reference to brand names is to establish a quality level of material/equipment and available options. All accessories must be provided as standard and/or optional equipment. Recommended brands are AAON, Carrier, Lennox, Trane, Rheem, Goodman, RUUD, or equivalent. Manufacturers regularly engaged in production of equipment of similar types as those specified herein and in similar service for not less than 5 years may be used only with approval of the COR.

Part 2 – Product

A. Electrical Requirements:

All electrical equipment shall operate on 208 volt three phase AC power. Low voltage transformers for control circuits must be furnished with the equipment they will operate. Verify that the electrical system is capable of handling the heat pump unit as specified prior to installation.

B. Packaged Heat Pump:

1. Provide Packaged Heat Pump and side discharge curb based on the following equipment:

a) AAON RN - 0 0 9 - 8 - 0 - E 6 0 S - 2 F 2 : B E A C - E 0 B - D S D - 0 A A - 0 D K A H B Z - 0 0 - 0 0 0 0 0 0 0 T B

b) Side Discharge Curb by Aladdin Metal Products compatible with AAON RN unit.

2. Refer to Attachment 1 for packaged heat pump specifications.

3. Refer to Attachment 2 for side discharge curb specifications.

C. Other Items:

1. Replace all electrical lines from the exterior unit to the disconnect box if existing does not meet industry standards or if existing line will not reach connection of proposed outside unit. No splicing will be acceptable in electrical wiring.

2. Provide and install disconnect switch for new HVAC equipment.

3. Provide and install motor starter for new HVAC equipment.

4. Provide and install new CO2 sensors.

5. Provide and install duct smoke detectors in the return air duct.

6. Outside air damper to close during unoccupied hours. Modulate outside air damper to maintain a differential of 700 ppm between outdoor and indoor air during occupied hours. Coordinate hours with COR.

Part 3 – Installation

A. Replace the low voltage wiring if required between the HVAC system and the thermostat.

B. Install new ductwork as necessary to meet project requirements. New ductwork to be insulated with 2 inches thick cellular glass insulation on all new outdoor ductwork with field-applied jacket based on Flex-Clad 400. New and existing ductwork to be sealed with water-based mastic.

C. The contractor shall complete all work necessary to repair the hole left by the removed A/C unit which includes fabrication, sealing, insulation, etc. The completed hole repair should exactly match the walls surrounding it.

D. Replace the condensate discharge line and insulate new lines.

E. Connect existing LP line to new units. If existing does not meet industry standards or if existing size is not adequate, replace with new.

F. Caulk all wall penetrations with an approved 25 year silicone caulking.

G. Replace and install a new 7 day programmable thermostat capable of, at a minimum, 5+1+1 day program. Install CO2 sensors next to thermostat.

H. Position of packaged unit shall have the proper clearances based on the manufacturer’s recommendations and approval from COR.

I. Duct Smoke Detectors

a. Duct smoke detectors shall be connected to a fire alarm system if applicable.

b. Upon activation, the smoke detectors shall shut down all operational capabilities of the air distribution system.

J. Commission system.

Part 4 – Product Information

4.01 Related Documents

4.02 General Description

A. This section includes the design, controls and installation requirements for packaged rooftop units / outdoor air handling units.

4.03 Quality Assurance

A. Unit shall be certified in accordance with UL Standard 1995/CSA C22.2 No. 236, Safety Standard for Heating and Cooling Equipment.

B. Unit and refrigeration system shall comply with ASHRAE 15, Safety Standard for Mechanical Refrigeration.

C. Unit shall be certified in accordance with ANSI Z21.47b/CSA 2.3b and ANSI Z83.8/CSA 2.6, Safety Standard Gas-Fired Furnaces.

D. Unit Energy Efficiency Ratio (EER) shall be equal to or greater that prescribed by ASHRAE 90.1, Energy Efficient Design of New Buildings except Low-Rise Residential Buildings.

E. Unit shall be safety certified by ETL and ETL US listed. Unit nameplate shall include the ETL/ETL Canada label.

F. Unit shall be approved for use in and outside High Velocity Hurricane Zones (HVHZ) by the Florida Building Code (FL# 15031), when using the required steel rooftop curb and attachment methods. Maximum allowable lateral wind pressure is +100psf/-100psf. Maximum allowable uplift is +50psf/-50psf. Positive and negative required design pressures calculated for use with this system shall be determined by others on a job specific basis in accordance with the governing code. Site specific pressures shall be less than or equal to the listed positive or negative allowable lateral wind design pressure and allowable uplift values for the product.

4.04 Delivery, Storage, and Handling

A. Unit shall be shipped with doors screwed shut and outside air hood closed to prevent damage during transport and thereafter while in storage awaiting installation.

B. Follow Installation, Operation, and Maintenance manual instructions for rigging, moving, and unloading the unit at its final location.

C. Unit shall be stored in a clean, dry place protected from construction traffic in accordance with the Installation, Operation, and Maintenance manual.

4.05 Warranty

A. Manufacturer shall provide a limited “parts only” warranty for a period of 12 months from the date of equipment startup or 18 months from the date of original equipment shipment from the factory, whichever is less. Warranty shall cover material and workmanship that prove defective, within the specified warranty period, provided manufacturer’s written instructions for Installation, Operation, and maintenance have been followed. Warranty excludes parts associated with routine maintenance, such as belts and filters.

4.06 Manufacturer

A. Products shall be provided by the following manufacturers:

1. AAON, Carrier, Lennox, Trane, Rheem, Goodman, RUUD, or equivalent.

2. Substitute equipment may be considered for approval that includes at a minimum:

a. R-410A refrigerant

b. Variable capacity compressor with 10-100% capacity control

c. Direct drive supply fans

d. Double wall cabinet construction

e. Insulation with a minimum R-value of 13

f. Stainless steel drain pans

4.07 Rooftop Units

A. General Description

1. Packaged rooftop unit shall include compressors, evaporator coils, filters, supply fans, dampers, air-cooled condenser coils, condenser fans, reheat coil, gas heaters, exhaust fans, and unit controls.

2. Unit shall be factory assembled and tested including leak testing of the DX coils, pressure testing of the refrigeration circuit, and run testing of the completed unit. Run test report shall be supplied with the unit in the service compartment’s literature pocket.

3. Unit shall have decals and tags to indicate lifting and rigging, service areas and caution areas for safety and to assist service personnel.

4. Unit components shall be labeled, including refrigeration system components and electrical and controls components.

5. Estimated sound power levels (dB) shall be shown on the unit ratings sheet.

6. Installation, Operation, and Maintenance manual shall be supplied within the unit.

7. Laminated color-coded wiring diagram shall match factory installed wiring and shall be affixed to the interior of the control compartment’s hinged access door.

8. Unit nameplate shall be provided in two locations on the unit, affixed to the exterior of the unit and affixed to the interior of the control compartment’s hinged access door.

B. Construction

1. All cabinet walls, access doors, and roof shall be fabricated of double wall, impact resistant, rigid polyurethane foam panels.

2. Unit insulation shall have a minimum thermal resistance R-value of 13. Foam insulation shall have a minimum density of 2 pounds/cubic foot and shall be tested in accordance with ASTM D1929-11 for a minimum flash ignition temperature of 610°F.

3. Unit construction shall be double wall with G90 galvanized steel on both sides and a thermal break. Double wall construction with a thermal break prevents moisture accumulation on the insulation, provides a cleanable interior, prevents heat transfer through the panel, and prevents exterior condensation on the panel.

4. Unit shall be designed to reduce air leakage and infiltration through the cabinet. Cabinet leakage shall not exceed 1% of total airflow when tested at 3 times the minimum external static pressure provided in AHRI Standard 340/360. Panel deflection shall not exceed L/240 ratio at 125% of design static pressure, at a maximum 8 inches of positive or negative static pressure, to reduce air leakage. Deflection shall be measured at the midpoint of the panel height and width. Continuous sealing shall be included between panels and between access doors and openings to reduce air leakage. Piping and electrical conduit through cabinet panels shall include sealing to reduce air leakage.

5. Roof of the air tunnel shall be sloped to provide complete drainage. Cabinet shall have rain break overhangs above access doors.

6. Access to filters, dampers, cooling coils, reheat coil, heaters, exhaust fans, compressors, and electrical and controls components shall be through hinged access doors with quarter turn, zinc cast, lockable handles. Full length stainless steel piano hinges shall be included on the doors.

7. Exterior paint finish shall be capable of withstanding at least 2,500 hours, with no visible corrosive effects, when tested in a salt spray and fog atmosphere in accordance with ASTM B 117-95 test procedure.

8. Units with cooling coils shall include double sloped 304 stainless steel drain pans.

9. Unit shall be provided with base discharge and return air openings. All openings through the base pan of the unit shall have upturned flanges of at least 1/2 inch in height around the opening.

10. Unit shall include lifting lugs on the top of the unit.

C. Electrical

1. Unit shall be provided with factory installed and factory wired, non-fused disconnect switch.

2. Unit shall be provided with a factory installed and factory wired 115V, 12 amp GFI outlet disconnect switch in the unit control panel.

3. Unit shall be provided with phase and brown out protection which shuts down all motors in the unit if the electrical phases are more than 10% out of balance on voltage, the voltage is more than 10% under design voltage or on phase reversal.

D. Supply Fans

1. Unit shall include direct drive, unhoused, backward curved, plenum supply fans.

2. Blowers and motors shall be dynamically balance and mounted on rubber isolators.

3. Motors shall be premium efficiency ODP with ball bearings rated for 200,000 hours service with external lubrication points.

4. Variable frequency drives shall be factory wired and mounted in the unit. Fan motors shall be premium efficiency.

E. Exhaust Fans

1. Exhaust dampers shall be sized for 100% relief.

2. Fans and motors shall be dynamically balanced.

3. Motors shall be premium efficiency ODP with ball bearings rated for 200,000 hours service with external lubrication points.

4. Access to exhaust fans shall be through double wall, hinged access doors with quarter turn lockable handles.

5. Unit shall include belt driven, forward curved exhaust fans.

6. Variable frequency drives shall be factory wired and mounted in the unit. Fan motors shall be premium efficiency.

F. Cooling Coils

1. Evaporator Coils

a. Coils shall be designed for use with R-410A refrigerant and constructed of copper tubes with aluminum fins mechanically bonded to the tubes and galvanized steel end casings. Fin design shall be sine wave rippled.

b. Coils shall have interlaced circuitry and shall be standard capacity.

c. Coils shall be hydrogen or helium leak tested.

d. Coils shall be furnished with factory installed expansion valves.

G. Refrigeration System

1. Unit shall be factory charged with R-410A refrigerant.

2. Compressors shall be scroll type with thermal overload protection and carry a 5 year non-prorated warranty, from the date of original equipment shipment from the factory.

3. Compressors shall be mounted in an isolated service compartment which can be accessed without affecting unit operation. Lockable hinged compress or access doors shall be fabricated of double wall, rigid polyurethane foam injected panels to prevent the transmission of noise outside the cabinet.

4. Compressors shall be isolated from the base pan with the compressor manufacturer’s recommended rubber vibration isolators, to reduce any transmission of noise from the compressors into the building area.

5. Each refrigeration circuit shall be equipped with expansion valve type refrigerant flow control.

6. Each refrigeration circuit shall be equipped with automatic reset low pressure and manual reset high pressure refrigerant safety controls, Schrader type service fittings on both the high pressure and low pressure sides and a factory installed replaceable core liquid line filter driers.

7. Unit shall include a variable capacity scroll compressor on the lead refrigeration circuit which shall be capable of modulation from 10-100% of its capacity.

8. Lead refrigeration circuit shall be provided with hot gas reheat coil, modulating valves, electronic controller, supply air temperature sensor and a control signal terminal which allow the unit to have a dehumidification mode of operation, which includes supply air temperature control to prevent supply air temperature swings and overcooling of the space.

9. Unit shall be configured as an air-source heat pump. Each refrigeration circuit shall be equipped with a factory installed liquid line filter drier with check valve, reversing valve, accumulator, and expansion valves on both the indoor and outdoor coils. Reversing valve shall energize during the heat pump cooling mode of operation.

10. Each refrigeration circuit shall be equipped with a liquid line sight glass.

H. Condensers

1. Air-Cooled Condenser

a. Condenser fans shall be a vertical discharge, axial flow, direct drive fans.

b. Heat pump outdoor coil shall be constructed of copper tubes with aluminum fins mechanically bonded to the tubes and aluminum end casings. Fin design shall be sine wave rippled.

c. Coils shall be designed for a minimum of 10°F of refrigerant sub-cooling.

d. Coils shall be hydrogen or helium leak tested.

e. Condenser fans shall be high efficiency electrically commutated motor driven with factory installed head pressure control module. Condenser airflow shall continuously modulate based on head pressure and cooling operation shall be allowed down to 35°F with adjustable compressor lockout.

I. Gas Heating

1. Unit shall include a natural gas furnace with 2 stages of capacity control.

2. Aluminized steel heat exchanger furnace shall carry a 15 year non-prorated warranty, from the date of original equipment shipment from the factory.

3. Gas furnace shall consist of aluminized steel heat exchangers with multiple concavities, an induced draft blower and an electronic pressure switch to lockout the gas valve until the combustion chamber is purged and combustion airflow is established.

4. Furnace shall include a gas ignition system consisting of an electronic igniter to a pilot system, which will be continuous when the heater is operating, but will shut off the pilot when heating is not required.

5. Unit shall include a single gas connection and have gas supply piping entrances in the unit base for through-the-curb gas piping and in the outside cabinet wall for across the roof gas piping.

6. Emergency gas heating capacity shall be sized to meet heating leaving air temperature set point when heat pump heating is not in operation. Auxiliary gas heating capacity shall be equal in capacity to the emergency gas heating capacity. Auxiliary heating capacity shall be available for operation when heat pump heating is in operation. Unit shall include 2 stages of auxiliary gas heating capacity.

J. Filters

1. Unit shall include 2 inch thick, pleated panel filters with an ASHRAE efficiency of 30% and MERV rating of 8, upstream of the cooling coil.

2. Unit shall include 0-100% economizer consisting of a motor operated outside air damper and return air damper assembly constructed of extruded aluminum, hollow core, airfoil blades with rubber edge seals and aluminum end seals. Damper blades shall be gear driven and designed to have no more than 20 cfm of leakage per sq ft. at 4 in. w.g. air pressure differential across the damper. Low leakage dampers shall be Class 2 AMCA certified, in accordance with AMCA Standard 511. Damper assembly shall be controlled by spring return DDC actuator. Unit shall include outside air opening bird screen, outside air hood, and barometric relief dampers.

K. Controls

1. Factory Installed and Factory Provided Controller

a. Unit controller shall be capable of controlling all features and options of the unit. Controller shall be factory installed in the unit controls compartment and factory tested. Controller shall be capable of standalone operation with unit configuration, set point adjustment, sensor status viewing, unit alarm viewing, and occupancy scheduling available without dependence on a building management system.

b. Controller shall have an onboard clock and calendar functions that allow for occupancy scheduling.

c. Controller shall include non-volatile memory to retain all programmed values without the use of a battery, in the event of a power failure.

d. Constant Volume Controller

1. Unit shall modulate cooling with constant airflow to meet space temperature cooling loads.

2. With modulating hot gas reheat, unit shall modulate cooling and hot gas reheat as efficiently as possible, to meet space humidity loads and prevent supply air temperature swings and overcooling of the space.

3. Unit shall modulate heating with constant airflow to meet space temperature heating loads. Staged heating capacity shall modulate based on space temperature.

L. Accessories

1. Unit shall be provided with a safety shutdown terminal block for field installation of a smoke detector which shuts off the unit's control circuit.

4.08 Curbs

A. Curbs shall to be fully gasketed between the curb top and unit bottom with the curb providing full perimeter support, cross structure support and air seal for the unit. Curb gasket shall be furnished within the control compartment of the rooftop unit to be mounted on the curb immediately before mounting of the rooftop unit to the curb.

B. Curb shall have a horizontal supply and return air connection to connect to the existing ductwork. All transitions to the existing duct work shall be field coordinated and completed in the field.

C. Curb shall fully welded and have a solid bottom, supply plenum, return plenum and fully insulated.

4.09 Installation, Operation, and Maintenance

A. Installation, Operation, and Maintenance manual shall be supplied with the unit.

B. Installing contractor shall install unit, including field installed components, in accordance with Installation, Operation, and Maintenance manual instructions.

C. Start up and maintenance requirements shall be complied with to ensure safe and correct operation of the unit.